JPS5667467A - File system - Google Patents
File systemInfo
- Publication number
- JPS5667467A JPS5667467A JP14251679A JP14251679A JPS5667467A JP S5667467 A JPS5667467 A JP S5667467A JP 14251679 A JP14251679 A JP 14251679A JP 14251679 A JP14251679 A JP 14251679A JP S5667467 A JPS5667467 A JP S5667467A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- processor
- informs
- contents
- file
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
PURPOSE: To enable a processing system occupying a file device to attain access from a random route in a system where processing systems share the same file device, by providing bits in the file device.
CONSTITUTION: When processor 11 sends an access request to file controller 21, the access request is sent to command execution control circuit 212 via change-over circuit 211 unless controller 21 is in process of performing processing from another processor. Circuit 212 outputs a reserve request to reserve control circuit 312 in file device 31. On the other hand, decoder circuit 215 decodes the contents of protective information memory circuit 311 in device 31 and, when its contents are not the prescribed specific value, informs circuit 212 of that. Further, comparing circuit 214 compares information sent from processor 11 and stored in comparison information memory circuit 213 with the contents of circuit 311 and, when the both disagree, informs circuit 212 of that. Circuit 212 informs processor 11 that device 31 is in the access inhibition state and then releases device 31 through circuit 312.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14251679A JPS5667467A (en) | 1979-11-02 | 1979-11-02 | File system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14251679A JPS5667467A (en) | 1979-11-02 | 1979-11-02 | File system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5667467A true JPS5667467A (en) | 1981-06-06 |
Family
ID=15317166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14251679A Pending JPS5667467A (en) | 1979-11-02 | 1979-11-02 | File system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5667467A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62274448A (en) * | 1986-05-23 | 1987-11-28 | Hitachi Ltd | Control system for input/output device |
JPH02161513A (en) * | 1988-08-26 | 1990-06-21 | Oki Electric Ind Co Ltd | Double access controller for magnetic disk device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4843848A (en) * | 1971-10-06 | 1973-06-25 | ||
JPS52144236A (en) * | 1976-05-26 | 1977-12-01 | Hitachi Ltd | Information processing system |
JPS52155924A (en) * | 1976-06-21 | 1977-12-24 | Hitachi Ltd | Data file control unit |
JPS539434A (en) * | 1976-07-14 | 1978-01-27 | Hitachi Ltd | Data processor system |
JPS5627461A (en) * | 1979-08-13 | 1981-03-17 | Hitachi Ltd | File share control system |
-
1979
- 1979-11-02 JP JP14251679A patent/JPS5667467A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4843848A (en) * | 1971-10-06 | 1973-06-25 | ||
JPS52144236A (en) * | 1976-05-26 | 1977-12-01 | Hitachi Ltd | Information processing system |
JPS52155924A (en) * | 1976-06-21 | 1977-12-24 | Hitachi Ltd | Data file control unit |
JPS539434A (en) * | 1976-07-14 | 1978-01-27 | Hitachi Ltd | Data processor system |
JPS5627461A (en) * | 1979-08-13 | 1981-03-17 | Hitachi Ltd | File share control system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62274448A (en) * | 1986-05-23 | 1987-11-28 | Hitachi Ltd | Control system for input/output device |
JPH02161513A (en) * | 1988-08-26 | 1990-06-21 | Oki Electric Ind Co Ltd | Double access controller for magnetic disk device |
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